We don't support ~expiry in 1.6.0 register statements

This must have inadvertantly got merged in sometime as the code doesn't handle
this option, and configs/sip.conf.sample doesn't mention it as available. So
just remove it from the WARNING message


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.0@169558 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -6179,7 +6179,7 @@ static int sip_register(const char *value, int lineno)
 	if (hostname)
 		*hostname++ = '\0';
 	if (ast_strlen_zero(username) || ast_strlen_zero(hostname)) {
-		ast_log(LOG_WARNING, "Format for registration is [transport://]user[:secret[:authuser]]@domain[:port][/extension][~expiry] at line %d\n", lineno);
+		ast_log(LOG_WARNING, "Format for registration is [transport://]user[:secret[:authuser]]@domain[:port][/extension] at line %d\n", lineno);
 		return -1;
 	}
 	/* split user[:secret[:authuser]] */